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bef2cd8088
The "vm" CI job ran a single test (TestRunUbuntu2404 from tstest/integration/vms) on a privileged self-hosted runner. Its coverage is nearly all redundant with the modern natlab vmtest suite, which boots real Ubuntu VMs and already exercises connectivity, kernel TUN, SSH, Taildrop, ACME, and OS DNS integration on GitHub-hosted runners. The two things it tested that natlab didn't are added back as natlab tests so the runner can be decommissioned: TestUbuntuSystemdUnit runs tailscaled via the stock systemd unit that Linux packages ship (cmd/tailscaled/tailscaled.service with tailscaled.defaults as its EnvironmentFile) instead of launching the binary directly, verifying the unit's directives and its Type=notify readiness handshake. TestDNSExtraRecordsSearchDomains verifies that control-plane DNS ExtraRecords and search domains are resolvable through the guest's OS resolver (libc to systemd-resolved to quad-100). Updates #13038 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I8d0dfb8b8153289e7ca78f3af03dfece9497bfe8